Ok, first of all, you can't go all day without taking in anything.  You need to be taking in small amounts all day long, especially if you are still on liquids.  Protein shakes were not even an option for me, I hated them post-op.  Try adding clear protein powder to soups to up the protein, even when you are on mushies it will help.  The ice may have been too cold for your new tummy, so experiment with temperatures.  For me, warm and room temp were the only options for the fist month and a half and then one day cold became the way to go.  You just have to follow your stomach's whims right now and you will be much happier.  The best advice I got was to think of myself as a newborn baby and to think about all the various trials and tribulations of feeding a baby....right temp, right taste, right consistency...its all trial and error. 

Don't worry, this phase only seems slow right now, but it really passes much faster then you can imagine! 

I just realized that you haven't had the surgery yet!  My first statement stands though, you really can't go all day without something, its not surprising that your stomach is upset.  On the liquid pre-op you can have so much more, add soups in there, what about yogurt or s/f pudding, Popsicles and fudgesicles?